572 THE VOYAGE OF II.M.S. CHALLENGER. 



lateral wall of the ray, and is occupied by groups of large papulae, six or more in each, and 

 an occasional large forficiform pedicellaria. The infero-marginal plates, which stand at 

 the angular junction of the actinal and lateral surfaces of the ray, bear normally an 

 obliquely placed pair of equal, robust, truncate spinelets, slightly compressed at the tip, 

 which have a group of large pedicellaria? on their outer side similar to those above de- 

 scribed. Between these and the adambulacral plates is a series of isolated spinelets of the 

 same size as the oblique pair, but not compressed, and so placed that each appears to form 

 a trio with the pair. They bear on their outer side several large pedicellaria?, and are 

 separated by papulae. 



The armature of the adambulacral plates consists of two equal, short, obtusely tipped, 

 cylindrical, skin-covered spinelets, which radiate apart and form two regular longitudinal 

 series. Within the furrow is a series of rather large forficiform pedicellarise on membran- 

 ous pedicles, but they are entirely hidden from view when the inner series of spinelets 

 on the adambulacral plates are directed towards, or partly over, the furrow. 



The median interradial line, and a space extending on each side, is devoid of spinelets 

 or papula?, and is occupied only by a few isolated forficiform pedicellaria? which, by their 

 form, simulate conical, sharply pointed spinelets. 



The madreporiform body, which is rather near the margin, is difficult to find, being 

 often almost hidden by the vesiculated tufts of pedicellaria? which surround the spinelets 

 borne on the adjacent abactinal plates ; there is, however, no special circlet of spinelets 

 round the madreporite. 



The ambulacral tube-feet are crowded and quadriserial in arrangement. 



Colour in alcohol, a bleached brownish or yellowish white. 



Localities. — Station 313. Near the Atlantic entrance to the Strait of Magellan. 

 January 20, 1876. Lat. 52° 20' 0" S., long. 67° 39' 0" W. Depth 55 fathoms. Sand. 

 Bottom temperature 47° - 8 Fahr. ; surface temperature 48°"2 Fahr. 



Station 315. Port William, Falkland Islands. January 26, 1876. Lat, 51° 40' 0" S., 

 long. 57° 50' 0" W. Depth 12 fathoms. Sand, gravel. Surface temperature 50 o, Fahr. 



Remarks. — This species presents a close resemblance in its general habit to Asterias 

 meridionalis, but is distinguished by having only five rays, by the tuft-like character of 

 the abactinal spinelets with the vesiculated pedicellaria?, and by the regular presence of an 

 intermediate series of well-developed spines, with pedicellaria?, between the infero-mar- 

 ginal and adambulacral spines. 



6. Asterias rubens, Linnd. 



Asterias rubens, Linn<§, 1766, Systema Naturse, ed. xii. p. 1099. j 

 Asterias glacialis, Pennant, 1777, British Zoology, voL iv. p. GO. 

 Asterias clathrata, Pennant, 1777, British Zoology, vol. iv. p. 61. 

 Asterias hohatica, Retzius. 1805, Dissert, sist. spec. cog. Asteriarum, p. 22. 



